Liechtenstein

Tucked cozily between Switzerland and Austria, Liechtenstein, with an area of around 160 kilometres, is the richest German-speaking country in the world.

Liechtenstein has a policy of neutrality, and maintains no military. The country had abolished its army in 1868, after the Austro-Prussian war.

The Liechtenstein National Police is responsible for keeping order within the country. In case of a war, the country can assemble an army. In any case, the police maintains a trilateral treaty with Austria and Switzerland, which enables cross-border cooperation of police forces from the three countries.

Nauru

Nauru is the world's smallest island nation in the western Pacific Ocean, covering only 21 square kilometers. It maintains no defence forces, though they have a Nauru police force, which ensures order in the tiny island country.

Under an informal agreement, defence is the responsibility of Australia.

Marshall Islands

With a population of about 62,000, Marshall Islands is in the middle of the Pacific Ocean, just north of the Equator. It was granted the status of a sovereign nation in 1983 under a Compact of Free Association with the United States.

Under the agreement, the US would provide aid to the islands, in exchange for continued US military use of its missile testing range at one of its islands.

The country has the Marshall Island police, to carry out common police duties in the country.

Grenada

Grenada, known as the 'Island of Spice' is a tiny country located northwest of the islands of Trinidad and Tobago.

In 1983, the United States led an invasion of the then Communist country because of a coup and a power struggle that led to the execution of its prime minister. The US was worried that the country would be used by the Soviets as a refueling stop for airplanes loaded with weapons destined for communist insurgents in Central America.

After the invasion, the country turned into a democratic nation, and had not had a military ever since. The country relies on its very own Royal Grenada Police Force for policing in the country.

Grenada co operates closely with the US in fighting anti-narcotics and other crimes.

Click NEXT to read further

Image: Royal Grenada Police Force troops with members of the US militaryPhotographs: Horizontalrain.com

Palau

Palau is an island nation in the Pacific Ocean, and one of the world's youngest and smallest sovereign nations. It does not have any military force, but has a Palau National Police Force to carry out common police duties in the country.

In case of an attack, Palau will be protected by the United States, under an agreement.

Click NEXT to read further

Image: An aerial view of islands in PalauPhotographs: Jackson Henry/Reuters

Andorra

Being the sixth smallest nation in Europe did not stop this country from declaring war on Germany in 1914, with just a 10-man strong army! In later years, this army was replaced by the Andorran National Police.

If you own a gun, you are required to join this force!

Andorra is a full member of the United Nations, and has three protectors -- France and Spain, and the North Atlantic Treaty Organisation.

Solomon Islands

The Solomon Islands consist of nearly a thousand islands, covering a landmass of 28,000 square kilometers. They are a constitutional monarchy, with Queen Elizabeth II as the head of the state.

Between 1998-2006, a civil war left the country nearly bankrupt, so much so that the country's growth rate dropped to just 1 per cent. To resolve these issues, Australia and New Zealand stepped in to restore peace.

Eventually, the Solomon Islands Police Force was formed. In case of a war, the countries to step forward to help would be New Zealand and Australia.

Click NEXT to read further

Image: Policemen rest in front of a row of riot shields on the grounds of the country's Parliament HousePhotographs: Tim Wimborne/Reuters

Costa Rica

This Central American country which enjoys the title of 'The greenest country in the world' saw a 44-day civil war in 1948, which left almost 2,000 dead. Following the end of the war, the President at that time, officially abolished its Army in 1948.

The country has not had a formal standing army ever since. In 1996, the government formed Fuerza P blica, which keeps an eye on law enforcement, border patrol, and as an anti-narcotics squad.

Thanks to a treaty signed in 1947, the country can look to as many as 22 countries for assistance, which also includes the United States.